Trigger exception debug events on Promise reject.

test/mjsunit/es6/debug-promises/reject-caught-uncaught.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --expose-debug-as debug
+// Flags: --expose-debug-as debug --allow-natives-syntax
 
 // Test debug events when we only listen to uncaught exceptions and
-// there is a catch handler for the exception thrown in a Promise.
+// there is a catch handler for the to-be-rejected Promise.
 // We expect no debug event to be triggered.
 
 Debug = debug.Debug;
 
 var p = new Promise(function(resolve, reject) {
   resolve();
 });
 
 var q = p.chain(
   function() {
-    throw new Error("caught");
+    return Promise.reject(Error("caught reject"));
   });
 
 q.catch(
   function(e) {
-    assertEquals("caught", e.message);
+    assertEquals("caught reject", e.message);
   });
 
 function listener(event, exec_state, event_data, data) {
   try {
     assertTrue(event != Debug.DebugEvent.Exception);
   } catch (e) {
-    // Signal a failure with exit code 1.  This is necessary since the
-    // debugger swallows exceptions and we expect the chained function
-    // and this listener to be executed after the main script is finished.
-    print("Unexpected exception: " + e + "\n" + e.stack);
-    quit(1);
+    %AbortJS(e + "\n" + e.stack);
   }
 }
 
 Debug.setBreakOnUncaughtException();
 Debug.setListener(listener);